Group video calling on Skype is now available in the new Skype 5.0 Beta for Macs, which just rolled out this morning. Skype 5.0 for Windows came out only a couple weeks ago, and it is already here for Mac. The overall interface is much cleaner. Conversations get pushed up to the top of the sidebar based on most recent chats. I'm not sure if this is new or not, but in the version of Skype I just upgraded from, conversations stayed where they were, and I always had to scroll up and down among more than 100 open conversations to find the person talking to me (I use Skype mostly as an IM client). 
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